A symposium on sediment dynamics in geophysical flows using two-phase flow methodology

该奖项将向特拉华大学提供资金，以促进年轻研究人员的参与，并支持年轻学者作为第四届地球物理流动中沉积物动力学两相建模研讨会的特邀演讲者的旅行，研讨会将于2019年9月17日至19日在美国得克萨斯州纽瓦克的特拉华大学举行。该研讨会旨在通过将陆地、沿海和海洋系统的流体物理学家、海洋学家、地质学家、地貌学家和工程师聚集在一起，加快沉积物传输的进展。除了口头和海报介绍外，研讨会还将展示年轻研究人员的成就和开放源码建模工具研讨会。通过降低参与费用，将促进海洋学家、地貌学家和地质学家的参与，特别是早期职业研究人员(研究生、博士后研究人员和早期职业科学家和教职员工)的参与。此外，本次研讨会将扩大到更多的现场观测、实验室实验和用于测量地球物理流动中的多相流的仪器。计划平衡地涵盖陆地、沿海和海洋应用，并包括沉积物运输以外的多相流应用，如海气相互作用和植被上的流动。这项活动力求补充在过去二十年中取得的巨大进展，并大大受益于区域范围的开放源码模式，并促进传播和开发最近开始出现的波浪尺度和湍流/颗粒尺度过程的类似开放源码模式。本次研讨会将通过为用于泥沙输送的开源欧拉两相模型SedFoam主办一个3小时的临床研讨会，促进创建用于小规模过程的开源社区驱动的数值模拟工具。泥沙运动动力学涉及波浪、水流、湍流和泥沙颗粒之间复杂的非线性相互作用，泥沙颗粒具有一定的惯性和浓度范围。它一直是最具挑战性的流体力学问题之一，吸引了许多对湍流、多相流和颗粒流感兴趣的研究人员。在地球表面过程方面，在时间和空间尺度上存在很大差异，以进一步解决各种紧迫问题，如沉积物从源到沉、海平面上升和风暴强度增加对海岸线演变、沿海生境、基础设施的可持续性和沿海社区复原力的影响。为了加快在理解控制海岸变化和地球表面过程的物理机制方面的进展，必须将流体力学、物理海洋学、地貌学和地质学领域的社区聚集在一起，召开一次专题讨论会，分享他们的研究结果，促进合作，并提供新的观点。专题讨论会将集中讨论：(1)解决地球物理流动中的跨尺度建模挑战。(2)确定几个有趣的实地观察背后的机制，并为高保真、基于流体力学的调查开发基准问题，社区可以在未来几年内解决这些问题。(3)推进泥沙运移建模，推广现有的和新的开源社区建模工具。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

This award will provide funding to the University of Delaware to facilitate the participation of young researchers and to support travel for young scholars as invited speakers to the 4th Symposium on Two-phase Modelling for Sediment Dynamics in Geophysical Flows will be held on September 17 ? 19, 2019 in the University of Delaware, Newark, DE, USA. The symposium aims at accelerating advances in sediment transport by bringing together fluid physicists, oceanographers, geologists, geomorphologists, and engineers in terrestrial, coastal and marine systems. In addition to oral and poster presentations, the symposium will feature achievements of young researchers and a workshop for open-source modeling tools. The participation of oceanographers, geomorphologists and geologists, especially those early career researchers (graduate students, postdoctoral researchers and early career scientists and faculty) will be facilitated by reducing participation costs. Furthermore, this symposium will be expanded to cover more field observation, laboratory experiments and instrumentation for measuring multiphase flow in geophysical flow. A balanced coverage of terrestrial, coastal and marine applications and including multiphase flow applications beyond sediment transport, such as air-sea interaction and flow over vegetation is planned. This activity seeks to complement the tremendous progresses made in the past two decades benefited significantly from regional scale open-source models and facilitate the dissemination and development of similar open-source models for wave-scale and turbulence/grain-scale processes that started to emerge recently. This symposium will promote the creation of open-source community-driven numerical modeling tools for small-scale processes by hosting a 3-hour clinical workshop for an opensource Eulerian two-phase model for sediment transport, SedFoam. Sediment transport dynamics involve complex nonlinear interaction between waves, currents, turbulence, and sediment particles with a range of particle inertia and concentration. It has been one of the most challenge fluid mechanics problems attracting many researchers interested in turbulent flows, multiphase flows and granular flows. In the context of earth surface processes, additional challenges arise from vastly different temporal and spatial scales to further address pressing issues such as sediment source to sink, impact of sea-level rise and increase storm intensity on shoreline evolution, coastal habitat and the sustainability of infrastructure and coastal community resilience. To accelerate the progress in understanding the physical mechanisms controlling coastal changes and earth surface processes, it is important to bring together communities from the areas of fluid mechanics, physical oceanography, geomorphology and geology into a symposium to share their findings, nourish collaboration and to provide new perspectives. The symposium will focus on: (1) Addressing cross-scale modeling challenges in geophysical flows. (2) Identifying mechanisms behind several intriguing field observations and develop benchmark problems for high-fidelity, fluid-mechanics-based investigations that the community can address in the next couple of years. (3) Advancing sediment transport modeling and promote existing and new open-source community modeling tools.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.